ODS Ferritic/martensitic alloys for Sodium Fast Reactor fuel pin cladding

Dubuisson, Philippe; Carlan, Y. de; Garat, Véronique; Blat, Martine

doi:10.1016/j.jnucmat.2011.10.037

Cited by 128 publications

(46 citation statements)

References 26 publications

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“…Research works performed during recent years have revealed that ODS (Oxide Dispersion Strengthened) steels are promising materials for fuel pin cladding in Sodium Fast Reactors [1,2]. It appears that the bcc ferritic-martensitic lattice allows for a high resistance to irradiation swelling up to a dose of around 150 displacements per atom (dpa) and nano-oxides significantly improve creep and tensile properties at high temperature (650°C) by blocking the dislocations motion.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the relationships between mechanical properties and microstructure in a Fe-9%Cr ODS steel

Hary

Guilbert

Wident

et al. 2016

EPJ Nuclear Sci. Technol.

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Abstract. Ferritic-martensitic Oxide Dispersion Strengthened (ODS) steels are potential materials for fuel pin cladding in Sodium Fast Reactor (SFR) and their optimisation is essential for future industrial applications. In this paper, a feasibility study concerning the generation of tensile specimens using a quenching dilatometer is presented. The ODS steel investigated contains 9%Cr and exhibits a phase transformation between ferrite and austenite around 870°C. The purpose was to generate different microstructures and to evaluate their tensile properties. Specimens were machined from a cladding tube and underwent controlled heat treatments inside the dilatometer. The microstructures were observed using Electron Backscatter Diffraction (EBSD) and tensile tests were performed at room temperature and at 650°C. Results show that a tempered martensitic structure is the optimum state for tensile loading at room temperature. At 650°C, the strengthening mechanisms that are involved differ and the microstructures exhibit more similar yield strengths. It also appeared that decarburisation during heat treatment in the dilatometer induces a decrease in the mechanical properties and heterogeneities in the dual-phase microstructure. This has been addressed by proposing a treatment with a much shorter time in the austenitic domain. Thereafter, the relaxation of macroscopic residual stresses inside the tube during the heat treatment was evaluated. They appear to decrease linearly with increasing temperature and the phase transformation has a limited effect on the relaxation.

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Section: Introductionmentioning

confidence: 99%

Investigation of the relationships between mechanical properties and microstructure in a Fe-9%Cr ODS steel

Hary

Guilbert

Wident

et al. 2016

EPJ Nuclear Sci. Technol.

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“…Oxide dispersion-strengthened (ODS) ferritic steels are being intensely investigated for high-temperature nuclear applications due to their excellent creep properties and swelling resistance [1]. These assets are obtained thanks to a fine-grained body-centred cubic microstructure reinforced by a dense and homogeneous precipitation of yttrium nanooxides.…”

Section: Introductionmentioning

confidence: 99%

In situ characterization of microstructural instabilities: Recovery, recrystallization and abnormal growth in nanoreinforced steel powder

et al. 2015

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“…The generation IV innovative concept of SFR introduces some specifications that are different from those of the past SFR which are not sustained by present materials. Consequently, new materials have to be qualified [1].…”

Section: Introductionmentioning

confidence: 99%

Resistance Upset Welding of ODS Steel Fuel Claddings—Evaluation of a Process Parameter Range Based on Metallurgical Observations

Corpace

Monnier

Grall

et al. 2017

Metals

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Abstract:Resistance upset welding is successfully applied to Oxide Dispersion Strengthened (ODS) steel fuel cladding. Due to the strong correlation between the mechanical properties and the microstructure of the ODS steel, this study focuses on the consequences of the welding process on the metallurgical state of the PM2000 ODS steel. A range of process parameters is identified to achieve operative welding. Characterizations of the microstructure are correlated to measurements recorded during the welding process. The thinness of the clad is responsible for a thermal unbalance, leading to a higher temperature reached. Its deformation is important and may lead to a lack of joining between the faying surfaces located on the outer part of the join which can be avoided by increasing the dissipated energy or by limiting the clad stick-out. The deformation and the temperature reached trigger a recrystallization phenomenon in the welded area, usually combined with a modification of the yttrium dispersion, i.e., oxide dispersion, which can damage the long-life resistance of the fuel cladding. The process parameters are optimized to limit the deformation of the clad, preventing the compactness defect and the modification of the nanoscale oxide dispersion.

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ODS Ferritic/martensitic alloys for Sodium Fast Reactor fuel pin cladding

Cited by 128 publications

References 26 publications

Investigation of the relationships between mechanical properties and microstructure in a Fe-9%Cr ODS steel

Investigation of the relationships between mechanical properties and microstructure in a Fe-9%Cr ODS steel

In situ characterization of microstructural instabilities: Recovery, recrystallization and abnormal growth in nanoreinforced steel powder

Resistance Upset Welding of ODS Steel Fuel Claddings—Evaluation of a Process Parameter Range Based on Metallurgical Observations

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